Improvement in casting screw-augers



UNrrED Sterns' PATENT trice.

J. CARL AND JAMES W'. HEATH, OF GREIIADA, MISSISSIPPI.

A IMPROVEMENT EN CASTING SCREW-AUGERS.

Specification forming part of Letters Iatent No. 29,66, dated August 2l,ISCO.

To @ZZ whom, it may concern:

Be it known that we. JONATHAN CARL and JAMES XV. HEATH, both of Grenada,in the county of Yalabusha and State of Mississippi, have invented a newand useful Improvement in Casting Spiral Angers, and we hereby deelarethe following to be a full, clear, and exact description thereof,reference being had to the accompanying drawings, making part of thisspecification.

Our said invention is chieiiy designed to facilitate the construction ofangers adapted for boring earth and analogous uses.

Its novelty consists in a peculiar construction and combination vofpatterns, and in the mode of their application to form the molds, aswill be hereinafter fully explained.

In the accompanying drawings, Figure l represents a plan of the nowelinverted, showing the fbllow-board with patterns in position thereonready for the packing. Fig. 2 isa top View of the same with thefollow-board removed and the patterns ready for drawing. Fig. 3 is aplan of the cope in its inverted position when lpacked with sand, theshaft Ybeing removed and the spirals ready for drawing.

B represents the nowel or lower part of the ask, and F, Fig. l, the faceof the followbtaL-d.

A is a semi-cylindrical pattern for one-half of the shaft. The saidpat-tern is fixed in position on the follow-board with its flat sidedown, as exhibited in Fig. l.

H are patterns of the spiral blades, formed in segments of ninety or onehundred and eighty degrees, and tapering in thickness from a sixteenthto an eighth of an inch to facilitate drawing. The said segments arefixed in position on the follow-board over the shaft-pattern A, t-hesaid board and the convex surface of the shaft-patterns being previouslymarked therefor, as seen at fin Fig. l.

C, Fig. 3, represents the under side of the cope.

H are segmental patterns, forming, in connection with the patterns H,complete spirals. c represents a semi-cylindrical cavity in the packing0f the cope, from whence apattern the counterpart of A has been drawn,as hercinafter explained.

7i are studs which are screwed into the thicker edge of each spiralpattern, to draw the saine,- as will be hereinafter explained.

The patterns above described and represented are formed of anysuitablematerial, and in number and size sufficient to construct an anger of thedesired dimensions.

llhe operation is as follows: The half-shaft pattern A is placed inposition on the followboard, as shown in Fig. l, and secured theretowith dowels or otherwise. The correctpositions for the spiral segmentsare then marked upon the follow-board and shaft, as seen at j' in Fig.l, and the patterns H doweled or otherwise secured thereto. The nowel isthen rammed with sand and turned to an upright position andthefollow-board removed. This stage of the operation is represented inFig. 2. A precise counterpart of the semi-cylindrical pattern A is thenplaced upon the latter with the flat side down, and secured thereto withdowels or otherwise, forming a complete shaft. The spiral segments H arethen placed, with dowels or otherwise, upon their mates H, so as to formin connection therewith complete spirals. The cope is then placed' inposition and rammed with sand, gates and channels being provided ineither form represented. The iask is then parted and each half shaftdrawn, and the spiral segments H and H each drawn separately, turningupon their axes in the direction of the thicker edge until clear of thesand. Segments of ninety degrees are drawn in a precisely similarmanner, excepting that they are drawn from the center each way, thethick edge of each having been placed uppermost, while t-he thin edgesmeet below. The flask is then closed together, a wrought-iron shaftbeing used, if desired, to which the spirals will be attached incasting; otherwise the space is left (either with or without a core) toform, in connection with the spirals, a hollow or a solid cast-metalshaft, as may be preferred.

vThe meta-l may be introduced through a spray from a singlepouring-hole, as seen atf,

2 QLGGS or through it Separate gate foi' every segment, as representedat g.

Ve claim as new and of oui` invention hereto set our hands.

in and desire to secure by Letters Patentl J. CARL.

for the formation of molds for casting spiral J osEPI-I H. FOSTER,

The combination of the Shafepattem A and l J. W. HEATH. the segmentalspirals H and H, Constructed, l f arranged, and applied in the mannerSet forth, I Vitnesses:

angers. C. GOODWIN.

In testimony of which invention We hereun-

